One should not interpret the word “Revolution” in its literal sense. Various meanings and significances are attributed to this word, according to the interests of those who use or misuse it. For the established agencies of exploitation it conjures up a feeling of blood stained horror. To the revolutionaries it is a sacred phrase.

Revolution did not necessarily involve sanguinary strife. It was not a cult of bomb and pistol. They may sometimes be mere means for its achievement. No doubt they play a prominent part in some movements, but they do not — for that very reason — become one and the same thing. A rebellion is not a revolution. It may ultimately lead to that end.
The sense in which the word Revolution is used in that phrase, is the spirit, the longing for a change for the better. The people generally get accustomed to the established order of things and begin to tremble at the very idea of a change. It is this lethargical spirit that needs be replaced by the revolutionary spirit. Otherwise degeneration gains the upper hand and the whole humanity is led stray by the reactionary forces. Such a state of affairs leads to stagnation and paralysis in human progress. The spirit of Revolution should always permeate the soul of humanity, so that the reactionary forces may not accumulate to check its eternal onward march. Old order should change, always and ever, yielding place to new, so that one “good” order may not corrupt the world. It is in this sense that we raise the shout “Long Live Revolution.”

Any man who stands for progress has to criticize, disbelieve and challenge every item of the old faith. Item by item he has to reason out every nook and corner of the prevailing faith. If after considerable reasoning one is led to believe in any theory or philosophy, his faith is welcomed. His reasoning can be mistaken, wrong, misled and sometimes fallacious. But he is liable to correction because reason is the guiding star of his life. But mere faith and blind faith is dangerous: it dulls the brain, and makes a man reactionary.

By "Revolution", we mean the ultimate establishment of an order of society which may not be threatened by such breakdown, and in which the sovereignty of the proletariat should be recognized and a world federation should redeem humanity from the bondage of capitalism and misery of imperial wars.

As quoted in Bhagat Singh and His Ideology (1981) by Shiri Ram Bakshi

I emphasize that I am full of ambition and hope and of full charm of life. But I can renounce all at the time of need, and that is the real sacrifice. These things can never be hinderance in the way of man, provided he be a man. You will have the practical proof in the near future.

Selected writings of Shaheed Bhagat Singh (1986), p. 65

If the deaf are to hear, the sound has to be very loud. When we dropped the bomb, it was not our intention to kill anybody. We have bombed the British Government. The British must quit India and make her free.

As quoted in Awakening Indians to India (2008), p. 82

The bomb was necessary to awaken England from her dreams. We dropped the bomb on the floor of the assembly chamber to register our protest on behalf of those who had no other means left to give expression to their heart-rending agony. Our sole purpose was to make the deaf hear and give the heedless a timely warning. Others have as keenly felt as we have done and from such seeming stillness of the sea of Indian humanity, a veritable storm is about to break out.

As Quoted in B. R. Agarwala (1991). Trials of Independence. National Book Trust, India. p. 128. ISBN 81-237-0259-6. Part of Bhagat Singh's statement during his trial.

Non-violence is backed by the theory of soul-force in which suffering is courted in the hope of ultimately winning over the opponent. But what happens when such an attempt fail to achieve the object? It is here that soul-force has to be combined with physical force so as not to remain at the mercy of tyrannical and ruthless enemy.

As quoted in The Sikh Review, Vol. 55 (2007), p. 173

The elimination of force at all costs is Utopian and the new movement which has arisen in the country and of whose dawn we have given a warning is inspired by the ideals which Guru Gobind Singh and Shivaji, Kamal Pasha and Reza Khan, Washington and Garibaldi, Lafayette and Lenin preached.

As Quoted in B. R. Agarwala (1991). Trials of Independence. National Book Trust, India. p. 128. ISBN 81-237-0259-6. Part of Bhagat Singh's statement during his trial.

Bombs and pistols do not make a revolution. The sword of revolution is sharpened on the whetting-stone of ideas.

We are not the originators of this cry. The same cry had been used in Russain revolutionary movement. Upton Sinclair, the well known socialist writer, has, in his recent novels Boston and Oil, used this cry through some of the anarchist revolutionary characters. The phrase never means that the sanguinary strife should ever continue, or that nothing should ever be stationary even for a short while. By long usage this cry achieves a significance which may not be quite justifiable from the grammatical or the etymological point of view, but nevertheless we cannot abstract from that the association of ideas connected with that.
All such shouts denote a general sense which is partly acquired and partly inherent in them. For instance, when we shout “Long Live Jatin Das”, we cannot and do not mean thereby that Das should Physically be alive. What we mean by that shout is that the noble ideal of his life, the indomitable spirit which enabled that great martyr to bear such untold suffering and to make the extreme sacrifice for that we may show the same unfailing courage in persuance of our ideal. It is that spirit that we allude to.